splash on firewalls(linux)

Linux is much easier on the command line

For a complete configuration, the simplest

iptables-L

You can do a little 'fast

iptables-nL

-N by the order to stop a reverse lookup and thus increase performance.

You can make it

iptables-t nat-L

iptables-t missing NL

iptables-t filter-L

iptables-t raw-NL

This list (-L), in particular, (t) of the chain, no reverse lookup (n).